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Review Question - QID 214889

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QID 214889 (Type "214889" in App Search)
A scientist is studying the effects of structural proteins on heart development and function. Specifically, she is studying the protein titin as it was identified in a genetic study of families with cardiac diseases. She uses CRISPR to generate the causative mutation in this protein and then introduces it into a rat model. At around 30 weeks after birth, she performs a cardiac ultrasound of the mutant rat line and compares the results with those obtained from wild type rats. Which of the following changes would most likely be observed in this experiment?